I posted about Adidas Adicolor earlier, but this new street campaign in Germany is amazing. First Adidas put up these blank canvases with their logo, encouraging graffiti artists and people to mess with it. Then a few days later they came back and placed a second poster over the graffiti so that some of the color and paint showed through. Not only does this get people to interact with the brand, it also becomes a part of the community, gives ownership up of the ad to the community and it perfectly communicates the Adicolor message. Brilliant work.